Reference

Figure 2- 1. Input Buffer Circuit

60 pF

1 k

+VCC

0.1 F THS4503

1 F

1 k

+

-

VI

+2.048 V

VOCM

 

-

+

 

 

1 F

1 k

 

 

0.1 F

-VCC

1 k

60 pF

2.2 Reference

25

(+) IN

25

 

 

 

 

6800 pF

 

 

 

 

 

 

 

 

 

(-) IN

The EVM allows users to select from three reference sources. The ADS8402/ADS8412EVM provides an onboard 4.096-V reference, U3. The EVM also has the provision for users to supply a reference voltage via connecter P1 pin 20. The user reference voltage and onboard reference voltages can be filtered by installing amplifier U1. Both the ADS8402 and ADS8412 analog-to-digital converters have integrated onboard reference buffers; therefore, it is not necessary to buffer the voltage externally. The reference buffer circuit on the EVM is not populated with an amplifier. The EVM comes installed with an on-chip internal reference tied directly to the reference pin of the converter. See Chapter 6 for the schematic.

Table 2- 2. Solder Short Jumper Setting

Reference

Description

Jumper Setting

 

 

Designator

1-2

2-3

 

 

 

 

 

SJP1

Not used on the EVM

 

 

 

 

 

 

SJP2

On-chip internal reference applied to reference pin

Installed

 

SJP3

Apply reference voltage from external source

Not Installed

Installed

 

 

 

 

 

Apply voltage to amplifier, U2, common-mode voltage pin

Installed

N/A

SJP4

Buffer onboard reference, REF3040

Installed

Not installed

 

 

 

 

 

Buffer user reference voltage applied at P1 pin 20.

Not Installed

Installed

 

 

 

 

SJP5

Select REF3040 for reference voltage

Installed

Not installed

 

 

 

 

 

Select buffered reference voltage

Not Installed

Installed

Factory set condition

Analog Interface

2-3

Page 13
Image 13
Texas Instruments ADS8402 EVM, ADS8412 EVM manual Reference, Solder Short Jumper Setting

ADS8402 EVM, ADS8412 EVM, ADS8402 specifications

Texas Instruments is renowned for its innovative semiconductor solutions, and the ADS8402 and ADS8412 analog-to-digital converters (ADCs) showcase the company's commitment to precision in data acquisition applications. The ADS8402 is a 16-bit, 2-channel ADC renowned for its high performance and versatility. It operates at data rates up to 1 MSPS (Mega Samples Per Second), making it ideal for a range of applications including industrial automation, high-speed data acquisition systems, and medical instrumentation.

The ADS8402 boasts a differential input architecture that enhances noise immunity and improves measurement accuracy. With features such as integrated voltage reference and a programmable gain amplifier, the device allows for adaptability in handling various signal levels. Its low power consumption further extends its appeal for portable and battery-operated devices. The device comes equipped with an internal clock generator, simplifying system design by reducing external components.

For developers looking to evaluate the performance of the ADS8402, the ADS8402 EVM (Evaluation Module) provides a robust platform. The EVM includes the necessary hardware for quick and convenient testing of the device's capabilities. It features numerous connectivity options, enabling users to interface with a variety of microcontrollers and processors. Benefiting from TI's extensive software support, the EVM allows for easy data visualization and manipulation through compatible software platforms.

On the other hand, the ADS8412 is an advanced 16-bit ADC with a single channel and supports faster sampling rates up to 2 MSPS. It is designed for applications requiring high precision and high throughput. The device features an integrated digital filter that significantly lowers noise and enhances signal integrity. The ADS8412 is particularly well-suited for precision measurement systems in industries such as telecommunications and data acquisition.

The ADS8412 EVM caters to users who wish to explore the capabilities of the ADS8412 with ease. Similar to the ADS8402 EVM, the ADS8412 evaluation module provides structured support for testing with readily available interfaces. This makes it an invaluable tool for engineers and developers looking to integrate high-performance ADCs into their designs.

Both the ADS8402 and ADS8412 ADCs exemplify Texas Instruments' dedication to delivering high-quality, innovative technologies that meet the demands of modern applications. With their combination of precision, speed, and adaptability, these ADCs are excellent choices for engineers seeking reliable data acquisition solutions.